72 lines
2.7 KiB
JavaScript
72 lines
2.7 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = getOverlappingDaysInIntervals;
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var _index = _interopRequireDefault(require("../toDate/index.js"));
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var _index2 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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var MILLISECONDS_IN_DAY = 24 * 60 * 60 * 1000;
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/**
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* @name getOverlappingDaysInIntervals
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* @category Interval Helpers
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* @summary Get the number of days that overlap in two time intervals
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*
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* @description
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* Get the number of days that overlap in two time intervals
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*
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* @param {Interval} intervalLeft - the first interval to compare. See [Interval]{@link docs/Interval}
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* @param {Interval} intervalRight - the second interval to compare. See [Interval]{@link docs/Interval}
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* @returns {Number} the number of days that overlap in two time intervals
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* @throws {TypeError} 2 arguments required
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* @throws {RangeError} The start of an interval cannot be after its end
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* @throws {RangeError} Date in interval cannot be `Invalid Date`
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*
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* @example
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* // For overlapping time intervals adds 1 for each started overlapping day:
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* getOverlappingDaysInIntervals(
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* { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
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* { start: new Date(2014, 0, 17), end: new Date(2014, 0, 21) }
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* )
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* //=> 3
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*
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* @example
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* // For non-overlapping time intervals returns 0:
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* getOverlappingDaysInIntervals(
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* { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
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* { start: new Date(2014, 0, 21), end: new Date(2014, 0, 22) }
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* )
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* //=> 0
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*/
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function getOverlappingDaysInIntervals(dirtyIntervalLeft, dirtyIntervalRight) {
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(0, _index2.default)(2, arguments);
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var intervalLeft = dirtyIntervalLeft || {};
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var intervalRight = dirtyIntervalRight || {};
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var leftStartTime = (0, _index.default)(intervalLeft.start).getTime();
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var leftEndTime = (0, _index.default)(intervalLeft.end).getTime();
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var rightStartTime = (0, _index.default)(intervalRight.start).getTime();
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var rightEndTime = (0, _index.default)(intervalRight.end).getTime(); // Throw an exception if start date is after end date or if any date is `Invalid Date`
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if (!(leftStartTime <= leftEndTime && rightStartTime <= rightEndTime)) {
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throw new RangeError('Invalid interval');
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}
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var isOverlapping = leftStartTime < rightEndTime && rightStartTime < leftEndTime;
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if (!isOverlapping) {
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return 0;
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}
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var overlapStartDate = rightStartTime < leftStartTime ? leftStartTime : rightStartTime;
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var overlapEndDate = rightEndTime > leftEndTime ? leftEndTime : rightEndTime;
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var differenceInMs = overlapEndDate - overlapStartDate;
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return Math.ceil(differenceInMs / MILLISECONDS_IN_DAY);
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}
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module.exports = exports.default;
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